If I was you, I would diversify the collection a bit.
There are some amazing Speedmasters from the 70's (e.g. Mark II, III, IV, 4.5) that are quite appealing and can be bought for half the money.
I followed the other way around while collecting: first got a 1999's Mark 40 triple date (cal 1051) with blue dial.
Then got a Mark 4.5 (cal 1045) with blue soleil dial and tonneau case, followed next by a pristine Speedmaster 125 (cal 1041).
Recently, managed to find a Mark II from 1970 (cal 861) that the dial seems to be turning tropical.
What is missing now in my collection is a Moonwatch. If you give up on this one, I'm interested.
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